package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import com.sky.utils.WeChatPayUtil;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
@RequiredArgsConstructor
public class UserServiceImpl implements UserService {

    private final UserMapper userMapper;
    private final WeChatProperties weChatProperties;//配置类所定义的微信登录所需
    public static final String WX_LOGIN="https://api.weixin.qq.com/sns/jscode2session";//微信服务接口地址

    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxlogin(UserLoginDTO userLoginDTO) {
        //调用微信接口服务，获得当前微信用户的openId
        String openid = getOpenid(userLoginDTO.getCode());

        //判断openId是否为空，如果为空表示登录失败，抛出异常
        if(openid==null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //判断当前用户是否为新用户
        User user = userMapper.getByOpenid(openid);
        if(user==null){
            user=User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();

            //如果是新用户则自动完成注册
            userMapper.insert(user);
        }
        //返回这个用户对象
        return user;
    }

    /**
     * 调用微信接口服务，获取微信用户的openid
     * @param code
     * @return
     */
    private String getOpenid(String code) {
        // 请求参数封装
        Map<String, String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code", code);
        map.put("grant_type", "authorization_code");

        // 调用工具类，向微信接口服务发送请求
        String json = HttpClientUtil.doGet(WX_LOGIN, map);
        log.info("微信登录返回结果：{}", json);

        // 解析json字符串
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        log.info("微信用户的openid为：{}", openid);

        return openid;
    }

}
